Tham khảo tài liệu 'math word problem demystified phần 3', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | LESSON 6 Using Proportions IMPLEMENTATION Solve the proportion. 4 gallons 7 gallons 1120 . X . 1120-7 4-x 7840 4x 7840 _ 1960 square feet X 7 gallons will cover 1960 square feet. EVALUATION 4 __ 7 1120 i960 1120-7 4- 1960 7840 7840 EXAMPLE If the scale on a map reads 2 inches 50 miles how many miles are there between two cities whose distance on a map is inches SOLUTION GOAL You are being asked to find the distance between two cities. STRATEGY The ratio statement is The proportion is jib- LESSON 6 Using Proportions IMPLEMENTATION Â-LẾ 50 T 50 2x 375 2x 375 _ x miles X The cities are miles apart. EVALUATION 2__T5 50 X 2- 375 375 Try These 1. If a person can burn 120 calories in 15 minutes of cycling how many calories can the person burn in 75 minutes 2. If a pizza delivery person drives 276 miles in 3 days how many miles will the person drive in 5 days 3. If an author writes 3 chapters in 10 days how long will it take the author to write a 15-chapter book 4. If it takes 12 yards to make 3 costumes how many yards of material will be needed to make 10 costumes 5. If 4 pounds of grass seed will cover 1250 square feet how many pounds of grass seed will be needed to cover 3000 square feet LESSON 6 Using Proportions 6. If a person earns 3250 in 3 months how much will the person earn in 12 months 7. On a map the scale is 3 inches 240 miles. How far apart are two cities whose distance on a map is 8 inches 8. If two gallons of paint will cover 420 square feet of surface how many gallons of paint will be needed to cover 1050 square feet 9. If a recipe calls for cups of flour to serve 4 people how many cups of flour will be needed to make the recipe serve 9 people 10. If a merchant can order 5 pairs of the same kind of shoes for 89 how much will 12 pairs cost SOLUTIONS 120 calories X calories 15 min 75 min 15x 120-75 15x 9000 u5 x _ 9000 X 600 calories 276 miles X miles 3 days 5 days 3x 276-5 3a- 1380 zỵx _ 1380 TF- 3 A- 460 .
